Seawater carbonate chemistry, growth rate and hatching processes of Symsagittifera roscoffensis during experiments, 2012, supplement to: Dupont, Sam; Moya, Aurélie; Bailly, Xavier (2012): Stable photosymbiotic relationship under CO2-induced acidification in the acoel worm Symsagittifera roscoffensis. PLoS ONE, 7(1), e29568

• Main Authors: Dupont, Sam, Moya, Aurélie, Bailly, Xavier
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2012
• Subjects: Animalia; Benthic animals; Benthos; Bottles or small containers/Aquaria <20 L; Coast and continental shelf; Growth/Morphology; Laboratory experiment; North Atlantic; Reproduction; FOS Medical biotechnology; Single species; Symsagittifera roscoffensis; Temperate; Xenacoelomorpha; Experimental treatment; Salinity; Temperature, water; pH; Alkalinity, total; Partial pressure of carbon dioxide water at sea surface temperature wet air; Growth rate; Symsagittifera roscoffensis, hatching time; Symsagittifera roscoffensis, size at hatching; Symsagittifera roscoffensis, cocoon per female; Symsagittifera roscoffensis, cocoon per female per day; Symsagittifera roscoffensis, eggs per female; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Aragonite saturation state; Calcite saturation state; pH meter Metrohm, 826 pH mobile; Measured; Calculated using SWCO2 Hunter, 2007; Calculated; Calculated using seacarb after Nisumaa et al. 2010; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Sub-seabed CO2 Storage Impact on Marine Ecosystems ECO2; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.774445; https://doi.pangaea.de/10.1594/PANGAEA.774445

As a consequence of anthropogenic CO2 emissions, oceans are becoming more acidic, a phenomenon known as ocean acidification. Many marine species predicted to be sensitive to this stressor are photosymbiotic, including corals and foraminifera. However, the direct impact of ocean acidification on the relationship between the photosynthetic and nonphotosynthetic organism remains unclear and is complicated by other physiological processes known to be sensitive to ocean acidification (e.g. calcification and feeding). We have studied the impact of extreme pH decrease/pCO2 increase on the complete life cycle of the photosymbiotic, non-calcifying and pure autotrophic acoel worm, Symsagittifera roscoffensis. Our results show that this species is resistant to high pCO2 with no negative or even positive effects on fitness (survival, growth, fertility) and/or photosymbiotic relationship till pCO2 up to 54 K µatm. Some sub-lethal bleaching is only observed at pCO2 up to 270 K µatm when seawater is saturated by CO2. This indicates that photosymbiosis can be resistant to high pCO2. If such a finding would be confirmed in other photosymbiotic species, we could then hypothesize that negative impact of high pCO2 observed on other photosymbiotic species such as corals and foraminifera could occur through indirect impacts at other levels (calcification, feeding). : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).